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Promotional effect of indium on Cu/SiO2 catalysts for the hydrogenation of dimethyl oxalate to ethylene glycol
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2021-09-03 , DOI: 10.1039/d1cy01350e
Yuxi Xu 1 , Lingxin Kong 1 , Huijiang Huang 1 , Hui Wang 1 , Xiaofei Wang 1 , Shengping Wang 1 , Yujun Zhao 1 , Xinbin Ma 1
Affiliation  

The synthesis of ethylene glycol (EG) through hydrogenation of syngas-derived dimethyl oxalate (DMO) has been a promising method because syngas can be obtained from plentiful resources such as coal, natural gas, biomass, etc. In this work, we fabricated several indium-promoted Cu/SiO2 catalysts by a one-pot hydrolysis precipitation (HP) method for the DMO-to-EG reaction. The textural and physiochemical properties of the catalysts were revealed using multiple characterization methods. The intimate contact of Cu and In enhances the reduction of indium oxide and the formation of CuIn alloy. The introduction of indium also markedly improves the copper dispersion and formation of Cu0 active sites, which improve the activation of H2. The plentiful interface of Cu+–CuIn alloy prompts the conversion of the carbonyl group adsorbed on the Cu+ sites with the dissociated hydrogen on the vicinal CuIn alloy, which is confirmed by the higher TOF (Cu+) and the lower apparent activation energy (Ea) on the Cu1In/SiO2 catalyst. Both CuIn alloy and Cu0 species have a synergistic effect with Cu+, endowing the Cu1In/SiO2 catalyst with a higher EG yield (96%) in comparison with the Cu/SiO2 catalyst without doping.

中文翻译:

铟对草酸二甲酯加氢制乙二醇Cu/SiO2催化剂的促进作用

通过合成气衍生的草酸二甲酯 (DMO) 加氢合成乙二醇 (EG) 是一种很有前景的方法,因为合成气可以从煤炭、天然气、生物质丰富的资源中获得在这项工作中,我们制造了几种通过一锅水解沉淀 (HP) 法制备铟促进的 Cu/SiO 2催化剂,用于 DMO 到 EG 的反应。使用多种表征方法揭示了催化剂的结构和理化性质。Cu和In的紧密接触增强了氧化铟的还原和CuIn合金的形成。铟的引入也显着改善了铜的分散和 Cu 0活性位点的形成,从而提高了 H 2的活化. Cu + –CuIn 合金的丰富界面促使吸附在 Cu +位点上的羰基与邻近 CuIn 合金上的解离氢转化,这由较高的 TOF (Cu + ) 和较低的表观活化能得到证实( Ea) 在 Cu1In/SiO 2催化剂上。CuIn合金和Cu 0物种都与Cu +具有协同效应,与未掺杂的Cu/SiO 2催化剂相比,Cu1In/SiO 2催化剂具有更高的EG收率(96%)。
更新日期:2021-09-17
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